/*
* Author:      Marco Kuiper (http://www.marcofolio.net/)
*/

// Speed of the automatic slideshow
var slideshowSpeed = 20000;

// Variable to store the images we need to set as background
// which also includes some text and url's.
var photos = [ {
    "title" : "Il Casinò",
    "image" : "01.jpg",
    "url"   : "http://www.comunedisanremo.it",
  "firstline" : "Il Casinò",
  }, {
    "title" : "Villa Nobel",
    "image" : "02.jpg",
    "url"   : "http://www.comunedisanremo.it",
    "firstline" : "Villa Nobel",
  }, {
    "title" : "Il Casinò",
    "image" : "04.jpg",
    "url"   : "http://www.comunedisanremo.it",
    "firstline" : "Il Casinò",
  }, {
    "title" : "Portosole",
    "image" : "07.jpg",
    "url"   : "http://www.comunedisanremo.it",    
    "firstline" : "Portosole",
  }, {
    "title" : "La chiesa russa",
    "image" : "10.jpg",
    "url"   : "http://www.comunedisanremo.it",
    "firstline" : "La chiesa russa",
  }
];



$(document).ready(function() {
    
  // Backwards navigation
  $("#back").click(function() {
    stopAnimation();
    navigate("back");
  });
  
  // Forward navigation
  $("#next").click(function() {
    stopAnimation();
    navigate("next");
  });
  
  var interval;
  $("#control").toggle(function(){
    stopAnimation();
  }, function() {
    // Change the background image to "pause"
    $(this).css({ "background-image" : "url(/stile/immagini/btn_pause.png)" });
    
    // Show the next image
    navigate("next");
    
    // Start playing the animation
    interval = setInterval(function() {
      navigate("next");
    }, slideshowSpeed);
  });
  
  
  var activeContainer = 1;  
  var currentImg = 0;
  var animating = false;
  var navigate = function(direction) {
    // Check if no animation is running. If it is, prevent the action
    if(animating) {
      return;
    }
    
    // Check which current image we need to show
    if(direction == "next") {
      currentImg++;
      if(currentImg == photos.length + 1) {
        currentImg = 1;
      }
    } else {
      currentImg--;
      if(currentImg == 0) {
        currentImg = photos.length;
      }
    }
    
    // Check which container we need to use
    var currentContainer = activeContainer;
    if(activeContainer == 1) {
      activeContainer = 2;
    } else {
      activeContainer = 1;
    }
    
    /*if(currentImg > 1) {
     loadImage(photos[currentImg],activeContainer);
    }*/
    
    showImage(photos[currentImg - 1], currentContainer, activeContainer,currentImg);
    /*if(currentImg == 1) {
      loadImage(photos[currentImg,activeContainer]);
    }*/
              
  };
  var loadImage= function(photoObject, activeContainer) {
    if(photoObject != null){
  // Set the background image of the new active container
    $("#headerimg" + activeContainer++).css({
      "background-image" : "url(/slide/" + photoObject.image + ")",
      "display" : "none"/*,
      "z-index" : currentZindex*/
    });}
  }
      
  var currentZindex = -1;
  var showImage = function(photoObject, currentContainer, activeContainer,currentImg) {
    
    if(currentImg > 1) {
     loadImage(photos[currentImg],activeContainer);
    }
    
    animating = true;
    
    // Make sure the new container is always on the background
    currentZindex--;
    
    // Set the background image of the new active container
    $("#headerimg" + activeContainer).css({
      "background-image" : "url(/slide/" + photoObject.image + ")",
      "display" : "block",
      "z-index" : currentZindex
    });
    
    // Hide the header text
    $("#headertxt").css({"display" : "none"});
    
    // Set the new header text
    $("#firstline").html(photoObject.firstline);
    $("#secondline")
      .attr("href", photoObject.url)
      .html(photoObject.secondline);
    $("#pictureduri")
      .attr("href", photoObject.url)
      .html(photoObject.title);
    
    
    // Fade out the current container
    // and display the header text when animation is complete
     $("#headerimg" + currentContainer).fadeOut(8000, function() {
      setTimeout(function() {
        $("#headertxt").css({"display" : "block"});
        animating = false;
      }, 500);
    });
  };  
    
     
    
    
  
  var stopAnimation = function() {
    // Change the background image to "play"
    $("#control").css({ "background-image" : "url(/stile/immagini/btn_play.png)" });
    
    // Clear the interval
    clearInterval(interval);
  };
  
  // We should statically set the first image
  navigate("next");
  
  // Start playing the animation
  interval = setInterval(function() {
    navigate("next");
  }, slideshowSpeed);
  
});